Improved eook-deill



T. E. WHITE, or PHILADELPHIA;PENNSYLVANIA, AssleNoR To EIMSELE AND w. e. EEnEoEn, v0E SAME PLAGE.

Letters'Patent No. 63,681, dated April i), `1867; articulated March 29, 1867.

IMPEOVED EOGK-DEILL.

ein -rlphlxie' nient itin iljese tetiers @anni inn umliiiig part nf tin nm. 4

TO ALL ,WHOMIT MAY CONCERN: l Y

Be it known that I, TLB. WHITE, of Philadelphia, Pennsylrania, have invenited'. certain 'improvements in Rock-Drills; and I do hereby declare the following 'tobe a full, clear, and exact descrip-tion of the same, reference being had to the accompanying drawing, and to the letters of reference marked thereom/l' My invention consists ofV a drill composed of a stock and certain cutters constructed and armnged'as fully described hereafter, so as to beiirmly secured to the stock, and detached when required. My'invcntion further consists of certain radial andcurved cutting and roaming edges, so arranged as to insure the rapid cutting away of the rock, without the necessity of frequently--resharpening. the cutters. V

In order to enable others skilled in the artto make and use my invention, I will now proceedto describe its' construction and operation.. Ou reference to the accompanying drawing, whichforms a part of this specification# Figure l'is a sectional view of my improved rockdrill, attached to the lower end of a, hollow drill-stock. i Figure 2, an inverted plan View; and I Figure 3,111. 'sectioned plan on the line 1 2, fig. 1. l 'A represents the lower end of Ila. hollow drill-stock or reservoir, to which is fitted a cylindrical blocli'C.4 An opening, in the centre of the block C,`is covered by a ila'p-v'alve, b, and through six holes in the cylinder zittend an equal number of rods, c, secured to six metal blocks vor sections, D D D und E'E E, which :1l-econ: fined to the cylinder by nuts, d, as shown in figs. 1 and rlhe'sections Di are 'longer than the sectionstEyaul the sides of each section arer'bcvelled so that the several sections may be ,packedV together, liittingwi'th radial joints, es seen in igr2. The sections -strc bevelle'd at the lowerlends, so as to form three radial cutting edges, :v ."v .1:the latter extending to the centre of the drill, while the -other two extend to within a short distance from this point.` ThersectionsrE project laterally ashort distance beyond the cylinder 0, and are so shapcdas to vforrnthree curved reeming edges, `y g/ y. vThe operating rod or rope may be ntlzachedi directly to the upper end of the stock or reservoir A, or Athe-lutter may be secured to the lowermost oi atscriesof tubes extending to the top of the well, and having arrcciprocating vertical motion imparted to them byeny suitable mechanism. As the drill is brought against the rock, the latter will be split and broken by the cutting edgesz a," of the cutters D, while thc realning edges g/will cnt away the rock so as to t'orm a circular openiug`,tthe detritus' and water iu the well being carried by thc actioiiof the drill and valve b into the reservoirA.V The sides of the' diii'erent cutters, D and E, being in close Contact, they'arc oifectually ,maintained in their proper places.` When the cutters have to be detachediiii.ord'cithnt'thcy may be shnrpcncdfor for any-other purpose, the block C is disconnected from the t'ubc, and the nuts ri are detached fromfthe' rods' c, when the different sections are at lib erty tobe withdrawn. I have found that byso arranging the cutters and reamers that thel edgesx and shall occupy thepositon in respect to cach other shown in iig. 2, a -inost ciiicicnt drill isA produced, the rock being rapidlycut away without the neccssity'ot frequently lrca-sharpening the drill-cutters. V Y l Without confining myself to any 4particular number of cutters, or totheprccise mode herein `described of .securing the cutters to the stock, I claim as my invention, anddesire to secure `by Letters Patent-f l 1. The combinatipn of a drill-stock and detachable cutters D E, when the latter are constructed and adapted' to each other, and for attachment to a stock, substantially 'as and for the purpose specified. l

2. The detachable block C, in combination with the drill-stock, andwith'the detachable cutters-D E, their rodsu', and nuts el, or their equivalents, the whole being constructednnd arranged 'substantie-.ily as and for the purpose set forth. l v

rock-drill haring three radial and thi-cc curved cutting edges arranged in respect to each other shown and described. I V 1 l, I i l l In testimony whereof I have signed my -nu'nle 4to this speciflcationin the presence el' two 'subscribing witnesses.

` THOIS. It. WHITEv Witnesses:

CIIAS; E. lios'ri-zn, Jenn Wnrrc. 

